In a grizzly bear game, eat all of the moths on screen (or watch someone do this).

Achievement Guide for Bug Free

Achievement won on 07 Oct 12TA Score for this game: 1,602
Posted on 07 October 12 at 05:16

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Scratch an area of rock until one set of moths come out. Once one group comes out stop scratching so no more show up. Simply move around so that your grizzly head eats all of the moths on the screen and that is your achievement!